When I was comped Platinum by AA in late April 1998, my travel agent (who did the heavy lifting to make it happen - thanks, Terry!) confirmed with them that I could requalify with 2/3 of the usual mileage. As it happened, I flew 50,000+ in eight months, but early on it was nice to know I wouldn't have to.

I don't know if this is standard procedure or something she arranged with her sales rep. I also don't know for a fact that it would have worked, but I'm pretty sure it would have.